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Diffstat (limited to 'libpthread/nptl/sysdeps/pthread/timer_create.c')
-rw-r--r--libpthread/nptl/sysdeps/pthread/timer_create.c170
1 files changed, 170 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/pthread/timer_create.c b/libpthread/nptl/sysdeps/pthread/timer_create.c
new file mode 100644
index 000000000..ae82c5af0
--- /dev/null
+++ b/libpthread/nptl/sysdeps/pthread/timer_create.c
@@ -0,0 +1,170 @@
+/* Copyright (C) 2000, 2003, 2004 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <errno.h>
+#include <signal.h>
+#include <pthread.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "posix-timer.h"
+
+
+/* Create new per-process timer using CLOCK. */
+int
+timer_create (
+ clockid_t clock_id,
+ struct sigevent *evp,
+ timer_t *timerid)
+{
+ int retval = -1;
+ struct timer_node *newtimer = NULL;
+ struct thread_node *thread = NULL;
+
+ if (0
+#if defined _POSIX_CPUTIME && _POSIX_CPUTIME >= 0
+ || clock_id == CLOCK_PROCESS_CPUTIME_ID
+#endif
+#if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0
+ || clock_id == CLOCK_THREAD_CPUTIME_ID
+#endif
+ )
+ {
+ /* We don't allow timers for CPU clocks. At least not in the
+ moment. */
+ __set_errno (ENOTSUP);
+ return -1;
+ }
+
+ if (clock_id != CLOCK_REALTIME)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ pthread_once (&__timer_init_once_control, __timer_init_once);
+
+ if (__timer_init_failed)
+ {
+ __set_errno (ENOMEM);
+ return -1;
+ }
+
+ pthread_mutex_lock (&__timer_mutex);
+
+ newtimer = __timer_alloc ();
+ if (__builtin_expect (newtimer == NULL, 0))
+ {
+ __set_errno (EAGAIN);
+ goto unlock_bail;
+ }
+
+ if (evp != NULL)
+ newtimer->event = *evp;
+ else
+ {
+ newtimer->event.sigev_notify = SIGEV_SIGNAL;
+ newtimer->event.sigev_signo = SIGALRM;
+ newtimer->event.sigev_value.sival_ptr = timer_ptr2id (newtimer);
+ newtimer->event.sigev_notify_function = 0;
+ }
+
+ newtimer->event.sigev_notify_attributes = &newtimer->attr;
+ newtimer->creator_pid = getpid ();
+
+ switch (__builtin_expect (newtimer->event.sigev_notify, SIGEV_SIGNAL))
+ {
+ case SIGEV_NONE:
+ case SIGEV_SIGNAL:
+ /* We have a global thread for delivering timed signals.
+ If it is not running, try to start it up. */
+ thread = &__timer_signal_thread_rclk;
+ if (! thread->exists)
+ {
+ if (__builtin_expect (__timer_thread_start (thread),
+ 1) < 0)
+ {
+ __set_errno (EAGAIN);
+ goto unlock_bail;
+ }
+ }
+ break;
+
+ case SIGEV_THREAD:
+ /* Copy over thread attributes or set up default ones. */
+ if (evp->sigev_notify_attributes)
+ newtimer->attr = *(pthread_attr_t *) evp->sigev_notify_attributes;
+ else
+ pthread_attr_init (&newtimer->attr);
+
+ /* Ensure thread attributes call for deatched thread. */
+ pthread_attr_setdetachstate (&newtimer->attr, PTHREAD_CREATE_DETACHED);
+
+ /* Try to find existing thread having the right attributes. */
+ thread = __timer_thread_find_matching (&newtimer->attr, clock_id);
+
+ /* If no existing thread has these attributes, try to allocate one. */
+ if (thread == NULL)
+ thread = __timer_thread_alloc (&newtimer->attr, clock_id);
+
+ /* Out of luck; no threads are available. */
+ if (__builtin_expect (thread == NULL, 0))
+ {
+ __set_errno (EAGAIN);
+ goto unlock_bail;
+ }
+
+ /* If the thread is not running already, try to start it. */
+ if (! thread->exists
+ && __builtin_expect (! __timer_thread_start (thread), 0))
+ {
+ __set_errno (EAGAIN);
+ goto unlock_bail;
+ }
+ break;
+
+ default:
+ __set_errno (EINVAL);
+ goto unlock_bail;
+ }
+
+ newtimer->clock = clock_id;
+ newtimer->abstime = 0;
+ newtimer->armed = 0;
+ newtimer->thread = thread;
+
+ *timerid = timer_ptr2id (newtimer);
+ retval = 0;
+
+ if (__builtin_expect (retval, 0) == -1)
+ {
+ unlock_bail:
+ if (thread != NULL)
+ __timer_thread_dealloc (thread);
+ if (newtimer != NULL)
+ {
+ timer_delref (newtimer);
+ __timer_dealloc (newtimer);
+ }
+ }
+
+ pthread_mutex_unlock (&__timer_mutex);
+
+ return retval;
+}